Granted Patent
Utility
US 6,422,326 · App. 09/591,008
Aphron-containing well drilling and servicing fluids of enhanced stability
Inventors:
Tommy F. Brookey, Roy F. House
Patented Case
View Patent ↗
Granted: Jul 23, 2002
Filed: Jun 9, 2000
Inventors
Tommy F. Brookey
Roy F. House
Assignee (at issue)
Actisystems, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.